Mortise lock



June 12,V 1928.

J. STRATMANN MORTISE LOCK Filed Aug. 27, 1926 Patented June 12, 1928.

N i UNITED .STA

TEs

PATENT OFFICE.

1 Mon'rrsn Loox.

Application led August 27, 1926, Serial No 132,020, `and in Australia October 14, 1925.

An object of this invention is to prov-ide improvements in mortise locks and their striking plates those now` largely used on double doors being relatively expensive.

They are cast, then hand and machine finished; or parte of the plates are pressed into shape, and are `riveted to other, usually cast, parte. The result-ing article is, in each case,

defective and my objectsinclude the makingv plates by simple l0 ot light., strong, accurate means, resulting in Agreater cheapness. Finishing, assembling and fitting of my plates is easy to elect. 'lhey lwill be easy to position to suit lock bolts and like movable members, and `will be when desired, reversible to suit either right hand` or left hand locks.

The first step in carrying thisinvention into eect is to prepare two `sheet metal blanks each of special form; the second step is to further` shape them as herein explained-and the final step is to iit them so vthat they become the tace plate and striking plate required.

In the accompanying drawings I illustrate my construction, but minor variations as to form may be made while retaining features hereinafter claimed.

Figure 1 is a face view of my blankfor a lock face plate.

Figure 2 is a face view of my blank for the striking plate.

Figure 3 is a perspective view of a mortise lock having the face plate itted.

Figure 4 is a perspective view ofthe striking plate.

Figure 5 is a plan ot the face and striking plates in their relative positions, when the doors are closed. The lock bolt and part of the lock body are shown by broken lines.`

Figure 6 1s a sectional plan of the parts in Figure 5. Y

F is my face plate blank; S is my striking plate blank; each is fiat and is stamped out of a sheet ot metal such asbrass.

Each blank has edges which are of irregular contour, not being straight, but these edges when further shaped produce edges some of which are straight, and some of which are curved as herein explained. They produce surfaces some of which are plane and someot' which are curved. To produce the said shapes each blank is subjected to pressure between dies in a suitable machine.

The flat face plate blank in Figure 1 has an upper and a lower edge F1, F3 respective-ly, and two longitudinal edges F2, F4 respectively. The flat striking plate blank in Figure 2, has an upper and a lower edge S41, s

`respectively and two longitudinal edges S2,

S* lrespectively.

The tace plate, Figure 3 has `flat surfaces -in3 different planes a., 5,0, and has an upper and a lower curved surface d, d respectively.

The `striking plate, Figure 4 has flat surfaces in 3 different planes al, b1, el, and has anupper and a lower curved surface D, D1., and a curved lip e. l

. The curved surfaces of the face plate are recessed, and the corresponding curved surfaces ot' the strikingplate are `bossed, all are so spaced apart lthat the intermediate parts of the respective plates meet as in Figunes 5 and `6. These curved surfaces can be polished bf a machine `without being hand finished. o avoid the production of sharp edges which might injure a workman or a user of the lock, the plates have slightly rounded edges F5, S5 respectively, these havinga good appearance.

he edges ot the face plate blank are contoured as follows. Each end F?, F3 has at one side a shallow recess; the edge F* has a slight and gradual rise between its ends; and the edge F2 has a shallow recess near each end. These edges become, in. the order stated in the completed plate, the edges marked fija, f4, f2, respectively. y

The edges ot' the st-rikin plate blank are contoured as follows. Eac end S1, S3 has at one side a shallow recess; the edge S4 has a shallow elongated depression between its ends, and the edge S2 has a central projecting lip S6. These edges become in the order stated in the completed pla-te, the edges marked s1, s3, s4 and s2 respectively, with the lug S6, the latter being when in use met by the spring bolt B of the lock L when the door is being closed.

During the pressing of the face plate blank to produce the completed plate, I also produce in the plate one or more bolt openings H, H1; and during the pressing of the striking plate blank to produce the conipleted` striking plate, l also produce in that plate oneor more bolt holes 7i, h1, in a corresponding position. i To allow of fastening each plate in its operative position l provide holes for screws, that is suitable countersinkings E which is effectable at any convenient time prior to lock fitting. lWhen countersinking the metal o the blank is displaced so as to produce on the other side of any selected countersinkings projecting circular flanges Il which will facilitate the fixing of the plate in correct 0perative position; such flanges will it into recesses in lock parts, or in building structures, as the case may be, although cases will arise in which flanges would not be required. Attention is directed to the fact that the surfaces b, a and c of each of the plates constitute in effect intermediate portions and parallel end portions which extend in opposite directions from the respective sides of the intermediate portions. This particular shape is effected when the blanks are pressed and by this construction it is to be noted that the face plate is fastened with one end portion on the enclosed bolt receiving edge of the lock casing the adjacent intermediate portion being arranged against a portion of the side wall of the lock casing. The plates are coi'nplemental so that when fitted respectively to the lock casing and door and to the door jamb a neat appearance is effected.

I claim z- 1. A lock having a face plate Wholly made of sheet metal pressed into completed form from a flat blank having four edges each of non-rectilineal contour, the said face plate having surfaces in three planes and two curved surfaces spaced apart Vforming an upper and a lower recess, also one or more bolt apertures and 'holes for fastening means, and rectilineal edges except at the curved surfaces.

2. A sheet metal face plate for a mortise lock, formed from a flat blank contoured with one edge slightly raisedl between its ends, an opposite edge slightly recessed near each end. and two ends each slightly recessed near one side. the blank being pressed and apertured to complete the face plate.

3. A lock as set forth in claim 1, and in which the face plate blank is contoured with one edge slightly raised between its ends, an opposite edge slight-ly recessed near each end, and two ends each slightly recessed near one side.

4. A lock as set forth in claim 1, and in which the face plate at the holes for the fastening means has its metal pressed to form circular flanges on the lock side of the plate for positioning purposes.

In witness whereof vI have hereunto set my hand.

J OSEPH' STRATMAN N 

